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DDR4 2400MHz PC4-19200 260 Pin Unbuffered Non-ECC 1.2V CL17 Dual Rank 2Rx8 based 512×8
Power Supply: VDD=1.2V (1.14V to 1.26V) VDDQ = 1.2V (1.14V to 1.26V)

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JEDEC standard 1.5V (1.425V ~ 1.575V) Power Supply
Module Size: 16GB Package: 2x8GB For Desktop Computer, Not for Laptop

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DDR4 2133MHz PC4-17000 260 Pin Unbuffered Non-ECC 1.2V CL15 Single Rank 1Rx8 based 1024×8
Power Supply: VDD=1.2V (1.14V to 1.26V) VDDQ = 1.2V (1.14V to 1.26V)

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DDR3L 1600MHz PC3-12800 204-Pin Unbuffered Non ECC 1.35V CL11 Dual Rank 2Rx8 based 512×8
JEDEC standard 1.35V (1.28V ~ 1.45V) and 1.5V (1.425V ~ 1.575V) Power Supply This is a dual voltage piece and can operate at 1.35V or 1.5V

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Design For Early 2019 iMac w/ Retina 5K Display model ID: iMac 19,1 (i5 3.0GHz, i5 3.1GHz, i5 3.7GHz, i9 3.6GHz)
Design For Late 2018 Mac Mini model ID: Mac Mini 8,1 (i3 3.6GHz, i5 3.0GHz, i7 3.2GHz)

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DDR3L 1600MHz PC3-12800 240 Pin Unbuffered Non-ECC 1.35V CL11 Dual Rank 2Rx8 based 512×8
JEDEC standard 1.35V (1.28V ~ 1.45V) and 1.5V (1.425V ~ 1.575V) Power Supply This is a dual voltage piece and can operate at 1.35V or 1.5V